System and method of adding a watermark to a JPEG image file

摘要

A plurality of signature bits to be used to generate a watermark in a JPEG image file is determined, wherein the JPEG image file comprises at least one quantization table. A plurality of locations in the at least one quantization table is selected. A respective value associated with each of the selected plurality of locations in the at least one quantization table is changed, based on the plurality of signature bits.

主权项

1. A method of watermarking an encoded image, comprising:
determining a plurality of signature bits to be used to generate a watermark in a JPEG image file, wherein the JPEG image file comprises a first quantization table and a second quantization table; selecting a first plurality of locations in the first quantization table and a second plurality of locations in the second quantization table; and changing respective values corresponding with each of the selected first and second plurality of locations in the first quantization table and the second quantization table, based on the plurality of signature bits.